I would go ??%. As a couple developers have stated that they arn't sure how much the PS3 can do or not.
Even if you did know it's not that helpful a stat since different developers and coders.
Some guy might use 99% of the PS3's power.
While another guy might be able to make the same game only using 70% of the PS3's power buy being smarter with how he coded it. I think. I'm no expert on coding however. Don't have the patience.